Donations can be made online at Chinese red cross website: www.chengduredcross.org
and there is also information on how to donate in english on this website: www.china-crossroads.com
If you are living in Chengdu you can donate anything you feel is useful to the Bookworm cafe, or to Cafe Paname - both are collecting and will deliver them on Friday.
TENTS, BLANKETS, PORTABLE MATTRESSES, etc. as well as NON-PERISHABLE FOOD ITEMS, WATER, and ANTIBIOTICS, ANTI-FLU MEDICINE. are all especially needed, so give generously.
This is all the information that I can gather as a foreigner living in China,please post any other ways in your city, or Chinese language alternatives, and give what you can. This is a true humanitarian disaster.